This project involved a septic system evaluation, sewer prioritization and a conceptual sewer design for Source Water Protection in the town of Peterborough. The two biggest drinking water supply wells for the town are located in close proximity to a densely populated residential development which was established in the early 70s. Most of the development was un-sewered and contained septic systems of varying ages and types. The septic system evaluation and sewer prioritization involved ranking un-sewered areas throughout the development based on different parameters affecting the potential migration of pollutants from failing septic systems into the groundwater supply. The conceptual sewer design involved an existing system analysis for impacts from additional homes, a conceptual layout including pipe lengths, pipe sizes and number of manhole structures and conveyance method considerations like gravity fed or pumping requirements. Three of the highest priority areas were recommended for sewering in the development which included Nichols Lane, Tarbell Road and Currier Avenue. Nichols Lane and Tarbell Road added seventeen new homes to the system that would require pumping to an existing gravity line. The pumping design utilized a low pressure system that consisted of grinder pumps located at each home tied to 2" and 3" force mains that follow the existing road topography. Currier Avenue added twenty one new homes that would be gravity fed to the existing system through 8" lines. The development of a septic system management plan was also recommended for the remaining un-sewered homes.
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